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Hepatitis e: epidemiology and natural history
1Department of Gastroenterology, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow 226014, India.
Journal of Clinical and Experimental Hepatology
|March 11, 2015
Summary
Hepatitis E virus (HEV) causes liver disease with distinct patterns globally. Genotypes 1 and 2 cause acute hepatitis in developing nations, while genotypes 3 and 4 lead to zoonotic infections and chronic disease in developed areas.
Area of Science:
- Hepatology
- Virology
- Epidemiology
Background:
- Hepatitis E is a significant global health concern caused by the Hepatitis E virus (HEV).
- HEV exists in four genotypes (1-4), with distinct transmission routes and clinical outcomes.
- HEV infection presents different epidemiological patterns in developing versus developed regions.
Purpose of the Study:
- To delineate the distinct epidemiological patterns of Hepatitis E infection worldwide.
- To understand the roles of different HEV genotypes in disease transmission and severity.
- To highlight variations in HEV infection outcomes based on geographic location and host factors.
Main Methods:
- Review of global epidemiological data on Hepatitis E virus (HEV) infection.
- Analysis of HEV genotype distribution and associated clinical presentations.
- Comparison of disease patterns in high-endemicity (Asia, Africa) versus low-endemicity (developed) regions.
Main Results:
- High-endemicity areas experience outbreaks of acute hepatitis from genotypes 1 and 2 HEV via fecal-oral waterborne transmission.
- Low-endemicity areas report sporadic, locally-acquired genotype 3 or 4 HEV infections, often zoonotic.
- Chronic HEV infection, leading to liver injury, is documented in immunosuppressed individuals in developed regions.
Conclusions:
- HEV exhibits diverse epidemiological behaviors globally, influenced by viral genotype and socioeconomic factors.
- Understanding these patterns is crucial for targeted prevention and control strategies.
- Further research is needed to elucidate the biological mechanisms behind these differing HEV patterns.
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